@misc{indiciae260c8a94fc8c,
  title = {Mars radar observations - A preliminary report.},
  author = {Downs, G. S. and Goldstein, R. M. and Green, R. R. and Morris, G. A.},
  year = {1971},
  url = {https://ntrs.nasa.gov/citations/19720031694},
  note = {Source identifier: 19720031694}
}